How to write to a file using C++?

In C++, you can use the ofstream class to write a file, open the file through the open() method, write to the file using the

#How to write a file using C++?

Introduction

In C++, you can use the ofstream class to write files. ofstream The object represents an output stream that can be written to a file.

Syntax

ofstream f;
f.open("myfile.txt");

This will create a file named myfile.txt and open it for writing.

Writing

To write to a file, use the << operator of the f object.

f << "Hello World" << endl;

This will write the "Hello World" string to the file, appending a newline character.

Close the file

After writing is completed, the file must be closed to release system resources.

f.close();

Practical case

The following is a simple example of writing "Hello World" to a file:

#include 
#include 

using namespace std;

int main() {
  // 打开文件
  ofstream f;
  f.open("myfile.txt");

  // 写入文件
  f << "Hello World" << endl;

  // 关闭文件
  f.close();

  return 0;
}

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